package www.itheima.compiterdemo;

public class test {
    public static void main(String[] args) {
        computer a=new computer();
        USB o=new mouse("罗技鼠标~~~~");
        USB o2=new keyboard("明天好键盘~~~~");
        a.something(o2);
        //a.something(o2);
        //USB o=new mouse("罗技鼠标~~~~");
        a.something(o);

    }



}
